force f=1n m=1kg b=0.4/m/sec


mx''=bx'' f
mx''=bx'-f



摩擦力= (0~2)

plot the response of position and velocity

類似這題


f=ma=mx''

mx''=-kx-bx'=mx'' bx' kx=0

k=1n/mg, m=1kg b=0.3n/m/sec

%Mechanical System
clear all;
dt=0.01;step=3/dt;
x1(1)=2;x2(1)=0;
m=1; k=1 ;b=0.3
for k=1:step
t(k)=k*dt;
x1(k 1)=x1(k) x2(k)*dt; %pos
x2(k 1)=x2(k) (-(b/m)*x2(k)-(k/m)*x1(k))*dt; %vel
end
t(k 1)=(k 1)*dt;
plot(t,x1,'r',t,x2,'b')

誰能解這題?